Thanks to a coating of fluffy, brittle panko instead of regular bread crumbs, tonkatsu (or pork katsu) is crunchier than most pork schnitzel, and the accompanying sauce gives it a jolt of tangy flavor. Pork katsu is easy to make at home, especially if you borrow some techniques from its schnitzel sibling.
Place each piece of pork between sheets of waxed paper. Pound meat to 1/8-inch thickness.
03Place eggs in a large shallow bowl; whisk in the Worcestershire and tomato paste. Place the panko and flour in two separate shallow bowls.
04Season cutlets with salt and pepper. Dip each cutlet in the flour (tap off excess), the egg mixture (ditto), then dredge in panko crumbs.
05Heat a large pan, pour in 1/8 inch of oil and heat for 30 seconds. Working in batches, put cutlets in the pan. Immediately shake and tilt it so the oil rolls over the pork in waves (this will give it a lighter, crisper crust). Shake the pan occasionally, until cutlets are golden on the bottom, about 3 minutes. Flip them and shake again. Cook 2 to 3 minutes longer. Transfer pork to a paper-towel-lined platter to drain.
06Pat the cucumbers dry with paper towels. Toss with scallions, vinegar, shiso, soy sauce, sesame oil and 1/2 teaspoon sugar. Serve cutlets with pickled cucumbers on the side.